This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.
%I A139786 #8 Dec 01 2016 07:42:23 %S A139786 0,1,13,127,1105,1255,24337,263671,725953,42823,40610545,163341463, %T A139786 780593185,5464152295,51309760081,45711664183,2200721587585, %U A139786 12583941205639,3454291215793,430419865184215,3012939056289505,10122098073837607,92791637157241105,517919756258420599 %N A139786 a(n) = 7^n mod 6^n. %H A139786 Seiichi Manyama, <a href="/A139786/b139786.txt">Table of n, a(n) for n = 0..1285</a> %Y A139786 Cf. k^n mod (k-1)^n: A002380 (k=3), A064629 (k=4), A138589 (k=5), A138649 (k=6), this sequence (k=7), A138973 (k=8), A139733 (k=9). %K A139786 nonn %O A139786 0,3 %A A139786 _N. J. A. Sloane_, May 20 2008